"A single Asian carp has been found for the first time beyond the electric barriers constructed to keep the dreaded invasive species out of the Great Lakes, state and federal officials announced Wednesday.

Commercial fishermen found the 3-foot-long, 20-pound carp in Lake Calumet on Chicago's South Side, about six miles downstream of Lake Michigan, according to the Asian Carp Regional Coordinating Committee.

While officials said they're concerned about the find, they need more information before deciding how significant it is."